[R] A question about forecasting with R
I want to forecaste the call number everyday for a call-center. Now I have removed the influence of the fluctuation with some method, so only thing left is to analyze the trend of the call number every day. I have thought of two ways: regression and HoltWinters smooth. But when I use regression, I find some day's call number will bcome negative, which is obviously unreasonabe. If I use HoltWinters smooth ,I let the gamma parameter equal to 0 because I needn't analyze the seasonal fact, but the result shows that the increasing trend is too big. I adjust the parameter alpha and beta ,which makes the result better,but I don't know if it's right. In this case of situation,which way is better? Or is there another appropriate method? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How can I use R through command line?
Suppose I have written a R program and saved it in test.R . How can I call the program in the command line? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Does R support double-exponential smoothing?
I want to use double-exponential smoothing to forecast time series datas,but I couldn't find it in the document,does R support this method? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to generate natural cubic spline in R?
Suppose I have two var x and y,now I want to fits a natural cubic spline in x to y,at the same time create new var containing the smoothed values of y. How can I get it? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to generate a new column according to some rule?
In a data frame I have a column "date" and a column "time",now I want to generate a new column which is the mean of the value of time group by date. In stata the command is egen scalls = mean(time),by(date) but I don't know the command in R, can anybody help me? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] A simple problem
I am a new R user. Now I have some problem while I use R. I have set up a data frame called "mydata". One of the colume of it was "skill". Now I want to select the observations of the frame whose "skill" value is 1,by what command can I get it? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Another question
I want to add a colume to a data frame by some rules, in stata the command is "gen" or "egen" ,but what is it in R? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] A beginner's question
I am a new R-language user. I have set up a data frame "mydata",one of the colume of which is "skill". Now I want to select the observations whose "skill" value is equal to 1,by what command can I get it? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
